https://apptovid.com/notification-sw.js

1self.addEventListener("install", () => {
2  self.skipWaiting();
3});
4
5self.addEventListener("activate", (event) => {
6  event.waitUntil(clients.claim());
7});
8
9self.addEventListener("notificationclick", (event) => {
10  event.notification.close();
11
12  const targetUrl = new URL(
13    event.notification.data?.url || "/",
14    self.location.origin,
15  ).href;
16
17  event.waitUntil(
18    clients
19      .matchAll({
20        type: "window",
21        includeUncontrolled: true,
22      })
23      .then(async (windowClients) => {
24        const targetClient = windowClients.find(
25          (client) => client.url === targetUrl,
26        );
27        if (targetClient) {
28          return targetClient.focus();
29        }
30
31        const siteClient = windowClients[0];
32        if (siteClient) {
33          try {
34            const navigatedClient = await siteClient.navigate(targetUrl);
35            return (navigatedClient || siteClient).focus();
36          } catch (error) {
37            console.warn("Cannot reuse the existing window, open a new window instead.", error);
38          }
39        }
40
41        return clients.openWindow(targetUrl);
42      }),
43  );
44});